Improvement in agricultural boilers



JOHN MURDOOK, OF SOUTH CARVER, MASSACHUSETTS.

IMPROVEMENT IN AGRICULTURAL BOILERS.

Specication forming part of Letters Patent No. 120,894, dated November14, 1871.

To all whom 'it may concern:

Be it known that I, JOHN MURDocK, of South Carver, in the coimty ofPlymouth and State of Massachusetts, have invented a new and usefulImprovement in Farm Boiler-Furnace; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing had to the accompanying drawing forming part of thisspecification.

My improvement in boiler-furnaces consists `in combining therewith adamper for direct draught, wherein the heat is carried completely aroundthe kettle in one united flue. The advantage of my improvement is, thatthe damper is enabled to give a much larger opening than can be producedon my former invention, where the upper portion of the kettle becomesheated, while opening directly' into the smoke-pipe and closing the iiuearound the kettle, all circulation is effectually arrested.

ln the accompanying drawing, Figure 1 is a vertical section of thefurnace and boiler taken on the line :v m of Fig. 2. Fig. 2 is avertical section of Fig. 1 taken on the line y y.

Similar letters of reference indicate corresponding parts.

A is the furnace, which does not differ (except in the matterhereinafter speciiied) from a farmboiler furnace now in use and wellknown to the public. B is the boiler. C is the iire-iiue. D is ahorizontal iiange projecting inward on the furnace, the inner edge ofwhich the lower portion of the boiler iits, as seen in Fig. 1. As thefurnaces have heretofore been made, this iiange is broken away on oneside a suflicient space to allow the smoke and heat to ascend andsurround the upper portion ofthe boiler, the broken space being directlybeneath the exit-nue. E is a continuation of the iiange D, terminatingin contact with the inwardly-projecting iiange F, around the rim or topof the furnace. It will be seen that iiange E covers the opening in theiiange D. The products of combustion are thereby conducted through theopening around the boiler and upward into the discharge-flue, thedischarge-orifice being directly above the part E. Now my improvementconsists in making a discharge-orifice, J, below the part E, andarranging in the discharge-flue G a sliding damper, H, by means of whicheither the upper orv the lower orifice may be closed while the otherremains open.

By this arrangement a direct draught is given to the furnace in startinga fire. The heat may be regulated as may be required by the contents ofthe boiler, as damage is frequently caused by allowing the full heat ofthe furnace to pass up around the boiler when the boiling is nearly orquite completed.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- In a boiler-furnace, A B O D, the flange E having oneoutlet above and another below it into the discharge-iiue G, combinedwith a sliding damper, H, as and for the purpose specified.

The above specification of my invention signed by me this 3d day ofMarch, 1871.

JOHN MU'BDOCK.

fr. B. Mosnnn. (59)

